Question

Calculați pătratele numerelor a,b,c,d: a=84÷6-3 puterea 2
b=105÷7
c=(9²-7²)÷4²
d=14²-16×12 ​

Answer 1

$a=84:6-3^2$

$a= 21 - 9 = 12$

$a^2 = 12^2 = 144$

$b=105:7 = 15$

$b^2 = 15^2 =225$

$c=(9^2-7^2):4^2$

$c = (81 - 49 ): 16 =$

$c = 32: 16 = 2$

$c^2 = 2^2 = 4$

$d=14^2-16 \cdot 12$

$d = 196 - 192 = 4$

$d^2 = 4^2 = 16$

Answer 2

Explicație pas cu pas:

$a = 84 : 6 - {3}^{2} = 14 - 9 = 5$

${a}^{2} = {5}^{2} = \bf 25$

$b = 105 : 7 = 15$

${b}^{2} = {15}^{2} = \bf 225$

$c = ( {9}^{2} - {7}^{2}) : {4}^{2} = (81 - 49) : 16 = 32 : 16 = 2$

${c}^{2} = {2}^{2} = \bf 4$

$d = {14}^{2} - 16 \times 12 = 196 - 192 = 4$

${d}^{2} = {4}^{2} = \bf 16$